Phenex Filter Membranes, Teflon (PTFE), 0.45 µm, 13 mm dia., Non-Sterile, 100/Pk. Phenex Filter Membranes, Teflon (PTFE), 0.45 µm, 13 mm dia., Non-Sterile, 100/Pk. Filtration Products (General Lab) No Phase. favorite_border Save to Favorites. Part No: AF0-0510. Qty: Price ( 100/Pk): $144.00.